[PATCH] ARM: imx6: gpc: always enable PU domain if CONFIG_PM is not set
p.zabel at pengutronix.de
Wed Jul 1 03:13:57 PDT 2015
Am Dienstag, den 30.06.2015, 14:48 +0200 schrieb Lucas Stach:
> If CONFIG_PM is not set the PU power domain needs to be enabled always,
> otherwise there are two failure scenarios which will hang the system if
> one of the devices in the PU domain is accessed.
> 1. New DTs (4.1+) drop the "always-on" property from the PU regulator, so
> if it isn't properly enabled by the GPC code it will be disabled at the
> end of boot.
> 2. If the bootloader already disabled the PU domain the GPC explicitly
> needs to enable it again, even if the kernel doesn't do any power
> management. This is a bit hypothetical, as it requires to boot a
> mainline kernel on a downstream bootloader, as no mainline bootloader
> disables the PM domains.
> Cc: <stable at vger.kernel.org> # 4.1
> Signed-off-by: Lucas Stach <l.stach at pengutronix.de>
> arch/arm/mach-imx/gpc.c | 27 ++++++---------------------
> 1 file changed, 6 insertions(+), 21 deletions(-)
Acked-by: Philipp Zabel <p.zabel at pengutronix.de>
More information about the linux-arm-kernel